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CX20703 Interface Diagram

09-2884

Audio

Speakers-on-a-Chip

www.conexant.com

General Information:

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International: 1+ (949) 483-3000

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Doc# PBR-202404

cx20703 features

CODEC

• 4-wireand5-wiredigitalaudioI/O(I2S/PCM/SPDIF), supporting

full duplex independent sampling rates

• One3-wireI2C or 4-wire SPI slave interface for external MCU

• EightGPIOpins

• 2.5Wx2BTLstereoClass-Dspeakeramplifier,also

configurableasaPWM

• Outputforexternalfeedback-lesstypeClass-Damplifier

• SpreadSpectrumforfilter-less,lowEMIoutput

• Uptothreesingle-endedlinein(convertibletoonestereodifferential

line in and one single-end)

• Twomicrophonesinterfaceswithon-chipbiassupply

• Integrated50mWheadphonedriverwithjacksense

• Differentiallineout

• 24-bitDAC/ADC,SNR102dB,THD-92dBat48kHz3.3V

• Audiosamplerate:8,11.025,12,16,22.05,24,32,44.1,48,64,

88.2, 96 kHz

• 90dBdynamicrangewith0.01percentTHD+Nat4Ω load

• 10-bitADCmultiplexedtosupportanalogvolumepotentiometer

and DC level detection

• Flexiblepowermanagement

• Variablemasterclockrates

– 7 mW stereo playback (1.8 V supply)

– 14 mW record and playback (1.8 V supply)

DSP

• Subbandacousticechosuppressionandcancellation

•Subband line echo cancellation

• Arraymicbeam-forming

• Noisereduction

• Dynamicloudnessadaptor

• Micautogaincontrol

• Digitalparametricequalizer(10bands/channel)

• Dynamicrangecompression

• 3DExpander(PhantommodeandImmersionmode)

ConfigurationTool

• FastconfigurationtoolviaUSB-to-I2C from PC

• DeviceconfigurationandDSPparameteradjustment

• OutputlogforconvenientMCUprogramming

Conexant Product Portfolio

Conexant’s comprehensive product portfolio includes solutions for imaging, audio, video, and embedded-modem applications.

The CX20703 is offered in a 76-pin QFN package and is compatible with Conexant’s CX20709 SPoC

DMA

DSP

Memory

DSP

DMA

DAC

DAC

ADC

ADC

Controller

DMA

SPI

UART

Jack

Sense

Clock

Circuitry

Bias

Generator

MON

ADC

Volume

Voltage

Monitor

SE or Diff

10 kW Line

2W Class-D

4 W PWM Out

2W Class-D

4 W PWM Out

MIC In

MIC In

MIC Bus

MIC Bus

XTAL In/

Master In

XTAL Out

Sense

ADC

ADC

Capless HP

Out 32 W

SE or Diff Line In

M

M

SE or Diff Line In

SE Line In

M

SE or Diff Line In

M

M

SE or Diff Line In

SE Line In

M

DAC

Capless HP

Out 32 W

SE or Diff

600 W or 10 kW Line

SE or Diff

10 kW Line